Motor and pump device

Abstract

The invention provides a motor and a pump device which can reduce the component cost of a driving magnet and a magnet holding component even if the driving magnet is prevented from shaking in the circumferential direction of a rotor relative to the magnet holding component. In a motor, a rotor (6) includes a driving magnet (14) and a magnet holding member (15) having the driving magnet attached to the outer peripheral side thereof. The magnet holding member includes a magnet contact portion (15d) that forms a holding member-side contact surface that is in contact with a magnet-side contact surface (14b) that is an end surface on one side of the driving magnet in the axial direction of the rotor. The magnet contact part (15d) is provided with a convex part (15g) which protrudes more toward the driving magnet than the holding member side contact surface, and the driving magnet is provided with a concave part (14c) which is recessed in the axial direction of the rotor from the magnet side contact surface and in which the convex part (15g) is arranged. The recessed portion forms a protruding portion on a side surface in a circumferential direction of the rotor, and the protruding portion is in contact with a side surface of the protruding portion in the circumferential direction of the rotor at a predetermined contact pressure.

Description

Technical Field

[0001] This invention relates to a motor and pump device. Background Technology

[0002] Conventionally, a motor used in pump assemblies is known (see, for example, Patent Document 1). The motor described in Patent Document 1 includes a rotor disposed on the inner circumferential side of a cylindrical stator. The rotor includes a cylindrical portion that holds a cylindrical drive magnet. An annular seat portion extending radially along the rotor is formed on the outer circumferential side of the cylindrical portion. A portion of the cylindrical portion further axially from the seat portion on the rotor's side forms a magnet holding portion, which fits into the inner circumferential side of the drive magnet to hold the drive magnet. One end face of the drive magnet in the axial direction of the rotor contacts one face of the seat portion.

[0003] In the motor described in Patent Document 1, multiple ribs extending axially along the rotor are formed on the outer peripheral surface of the magnet holder. The drive magnet is pressed into the magnet holder to contact the multiple ribs from the radially outer side of the rotor. An axially projecting protrusion is formed on one surface of the base. The protrusion engages with a recess formed on one end face of the drive magnet in the axial direction of the rotor. In the motor described in Patent Document 1, the protrusion and recess define the position of the drive magnet relative to the magnet holder in the circumferential direction of the rotor. Furthermore, the protrusion and recess prevent the drive magnet from rotating relative to the magnet holder. Existing technical documents Patent documents

[0004] Patent Document 1: Japanese Patent Application Publication No. 2022-183753 Summary of the Invention

[0005] In the motor described in Patent Document 1, due to the dimensional tolerances of the protrusion formed in the base and the concave portion formed in the drive magnet, a gap may occur between the protrusion and the concave portion in the circumferential direction of the rotor. In the motor described in Patent Document 1, the drive magnet is pressed into the magnet holding portion, therefore, even if a gap occurs between the protrusion and the concave portion in the circumferential direction of the rotor, it can prevent the drive magnet from wobbling relative to the magnet holding portion in the circumferential direction of the rotor.

[0006] On the other hand, in the motor described in Patent Document 1, in order to prevent the drive magnet from wobbling relative to the magnet holder in the circumferential direction of the rotor even if a gap exists between the convex and concave portions in the rotor's circumferential direction, it is necessary to make the inner circumferential surface of the drive magnet in contact with the outer circumferential surface of the plurality of ribs with a specified contact pressure. To ensure reliable contact between the inner circumferential surface of the drive magnet and the outer circumferential surface of the plurality of ribs with a specified contact pressure, it is necessary to strictly control the dimensional tolerances of the drive magnet and the magnet holder. Therefore, in the motor described in Patent Document 1, the cost of components such as the drive magnet may be very high.

[0007] Therefore, an object of the present invention is to provide a motor comprising a rotor having a cylindrical drive magnet and a magnet retaining member for mounting the drive magnet on its outer periphery, which can prevent the drive magnet from wobbling relative to the magnet retaining member in the circumferential direction of the rotor and reduce the component cost of the drive magnet and the magnet retaining member. Another object of the present invention is to provide a pump device comprising the above-described motor.

[0008] To address the aforementioned problems, a motor according to one aspect of the present invention includes: a rotor; and a stator formed in a cylindrical shape and disposed on the outer periphery of the rotor. The rotor includes: a cylindrical drive magnet; and a cylindrical magnet holding member. The drive magnet is mounted on the outer periphery of the magnet holding member. The axial direction of the cylindrical drive magnet and the axial direction of the cylindrical magnet holding member are aligned with the axial direction of the rotor. The magnet holding member includes a magnet contact portion, which forms a holding member-side contact surface. This holding member-side contact surface contacts an end face of the drive magnet on one side of the rotor's axial direction, i.e., the magnet-side contact surface. Either the drive magnet or the magnet contact portion has a protrusion formed on the rotor. The drive magnet and the magnet contact portion protrude further along the axial direction than the magnet-side contact surface or the retaining member-side contact surface towards either the drive magnet and the magnet contact portion. A recess is formed on either the drive magnet and the magnet contact portion, which is recessed along the axial direction of the rotor from the magnet-side contact surface or the retaining member-side contact surface, and is provided for the protrusion. The movement of the drive magnet relative to the magnet contact portion in the circumferential direction of the rotor is restricted by the protrusion and the recess. A protrusion is formed on the circumferential side of the rotor, which contacts the recess on the circumferential side of the rotor with a specified contact pressure. Alternatively, a protrusion is formed on the circumferential side of the rotor, which contacts the protrusion on the circumferential side of the rotor with a specified contact pressure.

[0009] In this type of motor, a protrusion is formed on either the magnet contact portion of the magnet holding member that holds the drive magnet or on either the drive magnet. This protrusion protrudes axially toward the other of the drive magnet and the magnet contact portion. A recess is formed on either the drive magnet or the magnet contact portion, recessed axially from the magnet-side contact surface or the holding member-side contact surface of the rotor, and is provided for the protrusion. Furthermore, in this type of motor, the protrusion forms a raised portion on the circumferential side of the rotor, which contacts the recess on the circumferential side of the rotor with a predetermined contact pressure; alternatively, the recess forms a raised portion on the circumferential side of the rotor, which contacts the protrusion on the circumferential side of the rotor with a predetermined contact pressure.

[0010] Therefore, in this method, even if the dimensional tolerances of the drive magnet and the magnet holding member are relaxed to a certain extent, it is possible to prevent the drive magnet from wobbling relative to the magnet holding member in the circumferential direction of the rotor by contacting the sides of the protrusions and recesses with a specified contact pressure in the circumferential direction of the rotor, or by contacting the sides of the protrusions and convexities with a specified contact pressure in the circumferential direction of the rotor. Therefore, in this method, even if wobbling of the drive magnet relative to the magnet holding member in the circumferential direction of the rotor can be prevented, the component costs of the drive magnet and the magnet holding member can be reduced.

[0011] The motor of this method can be used, for example, in a pump assembly comprising: an impeller rotating together with a rotor; and a pump chamber configured with the impeller and rotor for fluid passage. In this pump assembly, even if the drive magnet can be prevented from wobbling relative to the magnet holding member in the circumferential direction of the rotor, the component costs of the drive magnet and the magnet holding member can be reduced.

[0012] As described above, in one aspect of the present invention, the motor includes a rotor having a cylindrical drive magnet and a magnet holding member on which the drive magnet is mounted on its outer periphery. In this way, even if the drive magnet can be prevented from wobbling relative to the magnet holding member in the circumferential direction of the rotor, the component cost of the drive magnet and the magnet holding member can be reduced. Attached Figure Description

[0013] Figure 1 This is a cross-sectional view of the pump device according to an embodiment of the present invention. Figure 2 yes Figure 1 The diagram shows a three-dimensional view of the impeller and rotor. Figure 3 Shown from different directions Figure 2 The diagram shows a perspective view of the magnet holding component and the second blade component. Figure 4 yes Figure 3 The image shows a bottom view of the magnet holding component. Figure 5 yes Figure 2 A three-dimensional view of the driving magnet shown. Figure 6 yes Figure 5 The top view of the driving magnet shown. Figure 7 It is used to illustrate pressing the protrusion into Figure 2 A side view showing the sequence of operations in the recess. Figure 8 It is used to illustrate pressing the protrusion into Figure 2 A side view showing the sequence of operations in the recess. Detailed Implementation

[0014] Embodiments of the present invention will now be described with reference to the accompanying drawings.

[0015] (Overall structure of the pump unit) Figure 1 This is a cross-sectional view of the pump device 2 according to an embodiment of the present invention. Figure 2 yes Figure 1 The image shows a perspective view of the impeller 3 and rotor 6. In the following description, [the following will be used to describe them]. Figure 1 The Z1 direction side in the equation is called the "upper" side, and the opposite side is... Figure 1 The Z2 direction side in the equation is called the "down" side. In the following explanation, "up and down direction" is defined for ease of explanation and does not necessarily coincide with the direction of the plumb line (vertical direction).

[0016] The pump device 2 of this embodiment is a type of pump known as a shielded pump, used for circulating coolant such as cooling water. The pump device 2 includes: an impeller 3; a motor 4 for rotating the impeller 3; and a circuit board 5 for controlling the motor 4. The motor 4 consists of a rotor 6 and a stator 7. The impeller 3, motor 4, and circuit board 5 are disposed inside a housing 11, which is composed of a housing 8, a shell 9 covering the upper side of the housing 8, and a cover 10 covering the lower side of the housing 8. The axial direction of the rotor 6 is aligned with the vertical direction. That is, the vertical direction is the axial direction of the rotor 6.

[0017] The outer shell 8, shell 9, and cover 10 are made of resin. Shell 9 is joined to the upper end of outer shell 8 by ultrasonic welding or vibration welding, and cover 10 is joined to the lower end of outer shell 8 by ultrasonic welding or vibration welding. Shell 9 has a fluid (specifically liquid) intake section 9b and a fluid discharge section 9c. A pump chamber 12 is formed inside the shell 11, through which fluid drawn in from intake section 9b flows to discharge section 9c. Pump chamber 12 is formed by the division of outer shell 8 and shell 9. In the pump device 2, fluid is drawn in from the upper side of the pump device 2 and discharged in a direction orthogonal to the vertical direction.

[0018] The rotor 6 includes: a cylindrical drive magnet 14; a magnet holding member 15 that holds the drive magnet 14; and a cylindrical sleeve 16 held by the magnet holding member 15. The drive magnet 14 and the sleeve 16 are formed in a cylindrical shape. The magnet holding member 15 is formed in a cylindrical shape. Specifically, the magnet holding member 15 is formed in a generally cylindrical shape. The magnet holding member 15 is made of resin.

[0019] The axial directions of the drive magnet 14, the magnet holding member 15, and the sleeve 16 are aligned with the vertical direction. That is, the axial directions of the drive magnet 14, the magnet holding member 15, and the sleeve 16 are aligned with the axial direction of the rotor 6. The drive magnet 14 is mounted on the outer periphery of the magnet holding member 15, and the sleeve 16 is mounted on the inner periphery of the magnet holding member 15. The specific structures of the drive magnet 14 and the magnet holding member 15 will be described later.

[0020] The rotor 6 is rotatably supported by a fixed shaft 17 and rotates around the fixed shaft 17. The fixed shaft 17 is arranged such that its axial direction is aligned with its vertical direction. A recess is formed in the housing 9, and the upper end of the fixed shaft 17 is disposed in the recess. The lower end of the fixed shaft 17 is held by the housing 8. A portion of the fixed shaft 17 is disposed on the inner circumferential side of the sleeve 16. A thrust bearing component 18, which contacts the upper end face of the sleeve 16, is mounted on the fixed shaft 17. In this embodiment, the sleeve 16 functions as a radial bearing for the rotor 6, and the sleeve 16 and the thrust bearing component 18 function as a thrust bearing for the rotor 6.

[0021] Impeller 3 is disposed at the upper end of rotor 6. Impeller 3 rotates together with rotor 6. Impeller 3 and rotor 6 are disposed within pump chamber 12. Impeller 3 includes: a first blade component 21 made of resin, having a plurality of blades 21b arranged at a constant spacing along the circumference of rotor 6; and a second blade component 22 made of resin, which is separately formed from the first blade component 21, and the first blade component 21 is fixed to the second blade component 22. The impeller 3 of this embodiment is composed of the first blade component 21 and the second blade component 22.

[0022] The first blade component 21 is fixed to the upper side of the second blade component 22. The first blade component 21 is composed of a plurality of blades 21b and a top plate portion 21c for connecting the upper ends of the plurality of blades 21b. The second blade component 22 is integrally formed with the magnet holding component 15 by injection molding. That is, the magnet holding component 15 and the second blade component 22 are integrally molded resin components. The second blade component 22 is formed as a flange extending radially outward from the upper end of the magnet holding component 15. Alternatively, the second blade component 22, which is formed separately from the magnet holding component 15, can be fixed to the upper end of the magnet holding component 15.

[0023] The stator 7 is formed in a cylindrical shape. Specifically, the stator 7 is formed in a generally cylindrical shape. The stator 7 is disposed on the outer periphery of the rotor 6. The stator 7 is arranged in a manner that aligns with its axial direction and vertical direction. The stator 7 includes a drive coil 23, a stator core 24, and an insulator 25. The stator core 24 includes: an outer peripheral ring portion formed in an annular shape; and a plurality of salient pole portions protruding radially inward from the outer peripheral ring portion toward the rotor 6. The front end face of the salient pole portion (the radially inward surface of the rotor 6) faces the outer peripheral surface of the drive magnet 14 via the cylindrical portion 8b, which forms part of the housing 8 (described later). The insulator 25 is made of an insulating material such as resin. The drive coil 23 is wound around the salient pole portion of the stator core 24 via the insulator 25.

[0024] As described above, the outer casing 8 is made of resin. The outer casing 8 is integrally formed with the stator 7 to cover the drive coil 23, the stator core 24, and the insulator 25. In this embodiment, the outer casing 8 is integrally formed with the stator 7 by insert molding. The outer casing 8 includes: a cylindrical portion 8b, which is cylindrical and disposed between the front end face of the salient pole portion of the stator core 24 and the outer peripheral surface of the drive magnet 14; and a bottom 8c, which closes the lower end of the cylindrical portion 8b. The circuit board 5 is disposed on the lower side of the bottom 8c.

[0025] Circuit board 5 is a rigid plate such as glass epoxy board, formed into a flat plate shape. Circuit board 5 is arranged with its thickness direction aligned with its vertical direction. Furthermore, circuit board 5 is located on the outside of pump chamber 12. Circuit board 5 is fixed to housing 8 by fixing screws 26. Drive coil 23 is electrically connected to circuit board 5. Housing 8 serves to prevent fluid from the pump chamber 12 from flowing into the location where stator 7 and circuit board 5 are installed. Cover 10 is fixed to the lower end of housing 8 to cover circuit board 5 from below.

[0026] (Structure of the magnet holding component and the drive magnet) Figure 3 Shown from different directions Figure 2 A perspective view of the magnet holding component 15 and the second blade component 22 shown. Figure 4 yes Figure 3 The bottom view of the magnet holding component 15 shown. Figure 5 yes Figure 2 A perspective view of the drive magnet 14 shown. Figure 6 yes Figure 5 The top view of the drive magnet 14 shown. Figure 7 and Figure 8 This is a side view illustrating the sequence of operations in which the protrusion 15g is pressed into the recess 14c.

[0027] In the following description, the direction will be clockwise when viewed from above ( Figure 4 , Figure 6The CW direction in the equation is called the "clockwise direction," and the direction opposite to the clockwise direction ( Figure 4 , Figure 6 The CCW direction in this embodiment is referred to as the "counterclockwise direction". In this embodiment, the rotor 6 rotates in one direction relative to the stator 7. Specifically, the rotor 6 rotates only clockwise relative to the stator 7. That is, in the pump assembly 2, when the rotor 6 rotates clockwise relative to the stator 7, fluid is discharged from the discharge section 9c. The counterclockwise direction (CCW direction) in this embodiment is the direction opposite to the rotation direction of the rotor 6 relative to the stator 7, i.e., the "reverse direction".

[0028] As described above, the magnet holding member 15 is formed in a generally cylindrical shape. The magnet holding member 15 includes: a first cylindrical portion 15b constituting the lower portion of the magnet holding member 15; a second cylindrical portion 15c constituting the upper portion of the magnet holding member 15; and a flange-shaped magnet contact portion 15d disposed vertically between the first cylindrical portion 15b and the second cylindrical portion 15c (i.e., disposed vertically at the middle position of the magnet holding member 15). In this embodiment, the magnet holding member 15 is composed of the first cylindrical portion 15b, the second cylindrical portion 15c, and the magnet contact portion 15d.

[0029] The first cylindrical portion 15b and the second cylindrical portion 15c are cylindrical. The outer diameter of the second cylindrical portion 15c is larger than the outer diameter of the first cylindrical portion 15b. The second blade component 22 is connected to the upper end of the second cylindrical portion 15c. The magnet contact portion 15d is formed as a flange extending radially outward toward the rotor 6. The magnet contact portion 15d is formed as a flat plate with its thickness direction along the vertical direction. Alternatively, the magnet contact portion 15d is formed as an annular shape. The outer diameter of the magnet contact portion 15d is larger than the outer diameter of the second cylindrical portion 15c.

[0030] A drive magnet 14 is disposed on the outer peripheral side of the first cylindrical portion 15b. Multiple ribs 15e are formed on the outer peripheral surface of the first cylindrical portion 15b, contacting the inner peripheral surface of the drive magnet 14. The ribs 15e are formed as straight lines extending in the vertical direction. The multiple ribs 15e are formed at a constant interval along the circumference of the rotor 6. The inner peripheral side of the lower end of the drive magnet 14 is fixed to the lower end of the first cylindrical portion 15b by riveting.

[0031] The upper end face of the driving magnet 14 contacts the lower surface of the magnet contact portion 15d. In this embodiment, the upper end face of the driving magnet 14 is the magnet-side contact surface 14b. The lower surface of the magnet contact portion 15d becomes the holding member-side contact surface 15f that contacts the magnet-side contact surface 14b. That is, the magnet contact portion 15d has a holding member-side contact surface 15f that contacts the magnet-side contact surface 14b. The outer diameter of the driving magnet 14 is approximately equal to the outer diameter of the magnet contact portion 15d.

[0032] The magnet contact portion 15d has a protrusion 15g that protrudes downwards from the retaining member side contact surface 15f. That is, the magnet contact portion 15d has a protrusion 15g that protrudes vertically towards the driving magnet 14 from the retaining member side contact surface 15f. In this embodiment, three protrusions 15g are formed on the lower surface of the magnet contact portion 15d. The three protrusions 15g are arranged at a constant spacing along the circumference of the rotor 6. Furthermore, the protrusions 15g are formed in a cuboid shape extending radially along the rotor 6. That is, the magnet contact portion 15d has three protrusions 15g arranged radially. The number of protrusions 15g formed on the magnet contact portion 15d can be one, two, or more than four.

[0033] When viewed from above, the protrusion 15g is rectangular in shape, with its long side along the radial direction of the rotor 6. That is, the circumferential side of the protrusion 15g on the rotor 6 is a plane orthogonal to the circumferential direction. The lower surface of the protrusion 15g is a plane orthogonal to the vertical direction. The outer end face of the protrusion 15g in the radial direction of the rotor 6 forms part of the outer peripheral surface of the magnet contact portion 15d. The inner end face of the protrusion 15g in the radial direction of the rotor 6 connects to the outer peripheral surface of the first cylindrical portion 15b. In other words, the protrusion 15g is formed in the radial direction of the rotor 6 between the outer peripheral surface of the first cylindrical portion 15b and the outer peripheral surface of the magnet contact portion 15d.

[0034] A second protrusion 15h is formed on the inner end of the protrusion 15g in the radial direction of the rotor 6, protruding further downward than the protrusion 15g. That is, the magnet contact portion 15d has a second protrusion 15h that protrudes further towards the drive magnet 14 in the vertical direction than the protrusion 15g. The second protrusion 15h is formed in a cuboid shape. The upper end of the second protrusion 15h is connected to the lower surface of the protrusion 15g. The lower end face of the second protrusion 15h is a plane orthogonal to the vertical direction.

[0035] The inner end of the second protrusion 15h in the radial direction of the rotor 6 is connected to the outer peripheral surface of the first cylindrical portion 15b. The circumferential side surface of the second protrusion 15h in the rotor 6 is a plane orthogonal to the circumferential direction. The circumferential width of the second protrusion 15h in the rotor 6 is equal to the circumferential width of the protrusion 15g in the rotor 6. The circumferential side surface of the second protrusion 15h in the rotor 6 and the circumferential side surface of the protrusion 15g in the rotor 6 are located on the same plane.

[0036] The lower end face of the second protrusion 15h is chamfered at both ends in the circumferential direction of the rotor 6. The clockwise end of the lower end face of the protrusion 15g is also chamfered. On both sides of the protrusion 15g and the second protrusion 15h in the circumferential direction of the rotor 6, a recess 15k is formed, recessed upward from the contact surface 15f on the holding member side. The recess 15k is formed as a square groove parallel to the protrusion 15g. The recess 15k is formed radially on the rotor 6 between the outer peripheral surface of the first cylindrical portion 15b and the outer peripheral surface of the magnet contact portion 15d.

[0037] The driving magnet 14 is a resin magnet (plastic magnet) made by mixing magnetic powder with resin and molding it. The hardness of the driving magnet 14 is lower than that of the resin magnet holding member 15. In this embodiment, the driving magnet 14 is a low-hardness component, which is formed of a material with a hardness lower than that of the magnet holding member 15. The driving magnet 14 has a recess 14c that is recessed downward from the magnet-side contact surface 14b, which is the upper end face of the driving magnet 14. That is, the driving magnet 14 has a recess 14c that is recessed in the vertical direction from the magnet-side contact surface 14b.

[0038] In this embodiment, three recesses 14c are formed on the magnet-side contact surface 14b. That is, the driving magnet 14 has the same number of recesses 14c as the protrusions 15g. The three recesses 14c are arranged at a constant interval along the circumference of the rotor 6. The recesses 14c are formed as square grooves extending radially along the rotor 6, and the driving magnet 14 has three recesses 14c arranged radially. The outer end of the recess 14c in the radial direction of the rotor 6 communicates with the outer peripheral surface of the driving magnet 14. The inner end of the recess 14c in the radial direction of the rotor 6 communicates with the inner peripheral surface of the driving magnet 14. That is, the recesses 14c are formed in the radial direction of the rotor 6 between the outer peripheral surface and the inner peripheral surface of the driving magnet 14.

[0039] The bottom surface (lower surface) of the recess 14c is a plane orthogonal to the vertical direction. The side surfaces 14d and 14e of the recess 14c on the rotor 6 in the circumferential direction are planes orthogonal to the circumferential direction. In this embodiment, side surface 14d forms the clockwise side surface of the recess 14c, and side surface 14e forms the counterclockwise side surface of the recess 14c. A second recess 14f is formed at the inner radial end of the recess 14c, and this second recess 14f is recessed further downward than the recess 14c. That is, the drive magnet 14 has a second recess 14f that is more recessed in the vertical direction than the recess 14c. When viewed radially from the rotor 6, the second recess 14f has a rectangular shape.

[0040] The inner end of the second recess 14f in the radial direction of the rotor 6 is connected to the inner circumferential surface of the drive magnet 14. The lower surface of the second recess 14f is a plane orthogonal to the vertical direction. The side surface of the second recess 14f in the circumferential direction of the rotor 6 is a plane orthogonal to the circumferential direction. The width of the second recess 14f in the circumferential direction of the rotor 6 is equal to the width of the recess 14c in the circumferential direction of the rotor 6. The side surface of the second recess 14f in the circumferential direction of the rotor 6 is arranged on the same plane as the side surfaces 14d and 14e of the recess 14c.

[0041] The protrusion 15g of the magnet contact portion 15d is disposed within the recess 14c. That is, the protrusion 15g is embedded in the recess 14c. In this embodiment, the movement of the drive magnet 14 relative to the magnet contact portion 15d in the circumferential direction of the rotor 6 is restricted by the protrusion 15g and the recess 14c. A gap is formed between the bottom surface of the recess 14c and the lower surface of the protrusion 15g. A protrusion 14g is formed on the side surface 14e of the recess 14c, which contacts the side surface of the protrusion 15g in the circumferential direction of the rotor 6 (specifically, the side surface of the protrusion 15g in the counterclockwise direction) with a predetermined contact pressure. On the other hand, no protrusion 14g is formed on the side surface 14d of the recess 14c. That is, in the recess 14c, the protrusion 14g is only formed on the side surface 14e in the counterclockwise direction (i.e., the reverse direction).

[0042] Before the protrusion 15g is inserted into the recess 14c, the protrusion 14g is formed as a semi-cylindrical rod extending in the vertical direction. Before the protrusion 15g is inserted into the recess 14c, the lower end of the protrusion 14g is chamfered. On the side surface 14e of the recess 14c, a plurality of protrusions 14g are formed at radial intervals along the rotor 6. In this embodiment, three protrusions 14g are formed on the side surface 14e. As described above, the protrusions 14g contact the counter-clockwise side surface of the protrusion 15g with a predetermined contact pressure. Furthermore, the side surface 14d of the recess 14c contacts the clockwise side surface of the protrusion 15g with a predetermined contact pressure. That is, the protrusion 15g is pressed into the recess 14c.

[0043] The second protrusion 15h of the magnet contact portion 15d is disposed within the second recess 14f. A gap is formed between the lower surface of the second recess 14f and the lower surface of the second protrusion 15h. The clockwise side of the second protrusion 15h contacts the clockwise side of the second recess 14f. On the other hand, a gap is formed between the counterclockwise side of the second protrusion 15h and the counterclockwise side of the second recess 14f. In this embodiment, before the protrusion 15g is pressed into the recess 14c by moving the drive magnet 14 upward relative to the magnet contact portion 15d, the magnet contact portion 15d and the drive magnet 14 are positioned in the circumferential direction of the rotor 6 by the second protrusion 15h and the second recess 14f.

[0044] For example, when the convex part 15g is pressed into the concave part 15g, as Figure 7 , Figure 8 As shown, the drive magnet 14 and the magnet holding member 15 are reversed. First, as... Figure 7 As shown, the drive magnet 14 is directed relative to the magnet holding member 15 towards... Figure 7The lower side is moved so that the first cylindrical portion 15b of the magnet holding member 15 is positioned on the inner circumferential side of the drive magnet 14, and the magnet side contact surface 14b is placed on the end face of the second protrusion 15h. Thereafter, the drive magnet 14 is rotated relative to the magnet contact portion 15d.

[0045] When the driving magnet 14 rotates to the position where the second protrusion 15h and the second recess 14f are aligned in the circumferential direction of the rotor 6, the second protrusion 15h engages with the second recess 14c and the second recess 14f, as shown. Figure 8 As shown, the drive magnet 14 descends to the position where the protrusion 14g contacts the convex portion 15g. For example, the drive magnet 14 descends by approximately 1 mm. When the drive magnet 14 descends to the position where the protrusion 14g contacts the convex portion 15g, the magnet contact portion 15d and the drive magnet 14 are positioned in the circumferential direction of the rotor 6. In this state, when the drive magnet 14 is pressed further downward, the convex portion 15g is pressed into the recess 14c.

[0046] (Main effects of this implementation method) As described above, in this embodiment, the magnet contact portion 15d of the magnet holding member 15 has a protrusion 15g, and the drive magnet 14 has a recess 14c that engages with the protrusion 15g. In this embodiment, a protrusion 14g is formed on the side surface 14e of the recess 14c, and the protrusion 14g contacts the protrusion 15g on the side surface of the rotor 6 in the circumferential direction with a predetermined contact pressure.

[0047] Therefore, in this embodiment, even if the dimensional tolerances of the drive magnet 14 and the magnet holding member 15 are relaxed to a certain extent, the drive magnet 14 can be prevented from wobbling relative to the magnet contact portion 15d in the circumferential direction of the rotor 6 by the side surfaces of the protrusion 14g and the convex portion 15g contacting each other with a predetermined contact pressure in the circumferential direction of the rotor 6. Therefore, in this embodiment, even if the wobbling of the drive magnet 14 relative to the magnet holding member 15 in the circumferential direction of the rotor 6 can be prevented, the component costs of the drive magnet 14 and the magnet holding member 15 can be reduced.

[0048] In this embodiment, the rotor 6 rotates only clockwise relative to the stator 7. Furthermore, in this embodiment, the protrusion 14g is formed only on the counter-clockwise side surface 14e of the recess 14c. Therefore, in this embodiment, excessive load on the protrusion 14g can be prevented when the rotor 6 rotates. Additionally, in this embodiment, a plurality of protrusions 14g are formed on the side surface 14e, and these protrusions 14g are arranged at intervals in the radial direction of the rotor 6. Therefore, excessive load on any individual protrusion 14g can be prevented. Thus, in this embodiment, wear and other damage to the protrusions 14g can be suppressed.

[0049] In this embodiment, the protrusion 14g is formed on the drive magnet 14, which has a lower hardness than the magnet holding member 15. Therefore, in this embodiment, when the protrusion 15g is pressed into the recess 14c, the protrusion 14g is easily flattened. Therefore, in this embodiment, the operation of pressing the protrusion 15g into the recess 14c can be performed easily.

[0050] In this embodiment, the magnet contact portion 15d has a second protrusion 15h, and the drive magnet 14 has a second recess 14f disposed on the second protrusion 15h. Therefore, in this embodiment, as described above, before pressing the protrusion 15g into the recess 14c, the magnet contact portion 15d and the drive magnet 14 can be positioned in the circumferential direction of the rotor 6 using the recess 14c, the second recess 14f, and the second protrusion 15h. Therefore, in this embodiment, the operation of pressing the protrusion 15g into the recess 14c can be performed easily.

[0051] In this embodiment, the automatic assembly machine can perform the following actions: with the magnet-side contact surface 14b placed on the end face of the second protrusion 15h, the drive magnet 14 is moved relative to the magnet holder 15 along the circumferential direction of the rotor 6, and the magnet contact portion 15d and the drive magnet 14 are positioned in the circumferential direction of the rotor 6 using the recess 14c, the second recess 14f, and the second protrusion 15h; then, the drive magnet 14 is moved relative to the magnet contact portion 15d in the vertical direction to press the protrusion 15g into the recess 14c. That is, in this embodiment, the pressing action of pressing the protrusion 15g into the recess 14c can be performed using an automatic assembly machine.

[0052] (Other implementation methods) The above-described embodiments are examples of preferred embodiments of the present invention, but the present invention is not limited to these embodiments, and various modifications can be made without departing from the spirit of the present invention.

[0053] In the above embodiment, the number of protrusions 14g formed on the side surface 14e can be one. Furthermore, in the above embodiment, the protrusions 14g may be formed on the side surface 14d instead of on the side surface 14e, or they may be formed on both the side surface 14e and the side surface 14d. Additionally, in the above embodiment, the protrusions 14g do not necessarily have to be formed on the side surface 14e. In this case, the convex portion 15g has a convex portion that contacts the side surface 14e of the concave portion 14c on the circumferential side surface of the rotor 6 (specifically, the counterclockwise side surface).

[0054] In the above embodiment, the driving magnet 14 may have a protrusion that protrudes upward beyond the magnet-side contact surface 14b, and the magnet contact portion 15d may have a recess that recesses upward from the holding member-side contact surface 15f and is configured to accommodate the protrusion of the driving magnet 14. That is, the driving magnet 14 may have a protrusion that protrudes further towards the magnet contact portion 15d in the vertical direction than the magnet-side contact surface 14b, and the magnet contact portion 15d may have a recess that recesses in the vertical direction from the holding member-side contact surface 15f.

[0055] In this configuration, the movement of the drive magnet 14 relative to the magnet contact portion 15d in the circumferential direction of the rotor 6 is limited by the protrusion of the drive magnet 14 and the recess of the magnet contact portion 15d. Furthermore, in this configuration, the protrusion of the drive magnet 14 forms a protrusion on the circumferential side of the rotor 6, which contacts the recess of the magnet contact portion 15d on the circumferential side of the rotor 6 with a predetermined contact pressure; alternatively, the recess of the magnet contact portion 15d forms a protrusion on the circumferential side of the rotor 6, which contacts the protrusion of the drive magnet 14 on the circumferential side of the rotor 6 with a predetermined contact pressure.

[0056] In the above embodiment, a second protrusion 15h may be formed at the middle portion or outer end of the radially protruding portion 15g of the rotor 6, and a second recess 14f, in which the second protrusion 15h is disposed, may be formed at the middle portion or outer end of the radially recessed portion 14c of the rotor 6. In the above embodiment, the magnet contact portion 15d may also not have the second protrusion 15h formed. In this case, the drive magnet 14 does not have the second recess 14f formed.

[0057] In the above embodiments, the hardness of the driving magnet 14 can be greater than the hardness of the magnet holding member 15. That is, the magnet holding member 15 can be a low-hardness component, which is formed of a material with a hardness lower than that of the driving magnet 14. In the above embodiments, the hardness of the driving magnet 14 and the hardness of the magnet holding member 15 can be equal. In addition, in the above embodiments, the motor 4 can also be used in a device other than the pump device 2.

[0058] (Configuration of this technology) This technology can be configured as follows. (1) A motor comprising: a rotor; and a stator formed in a cylindrical shape and disposed on the outer periphery of the rotor. The rotor includes: a cylindrical driving magnet; and a cylindrical magnet holding member, wherein the driving magnet is mounted on the outer periphery of the magnet holding member. The axial direction of the cylindrical drive magnet and the axial direction of the cylindrical magnet holding member are aligned with the axial direction of the rotor. The magnet holding component includes a magnet contact portion, which forms a holding component side contact surface. This holding component side contact surface contacts the end face of the drive magnet on one side of the rotor in the axial direction, i.e., the magnet side contact surface. A protrusion is formed on either the driving magnet or the magnet contact portion, and this protrusion protrudes axially from the magnet-side contact surface or the retaining member-side contact surface toward either the driving magnet or the magnet contact portion. A recess is formed on either the drive magnet or the magnet contact portion, the recess being recessed along the axial direction of the rotor from the magnet-side contact surface or the retaining member-side contact surface, and for the protrusion to be disposed. The movement of the drive magnet relative to the magnet contact portion in the circumferential direction of the rotor is restricted by the protrusion and the recess. The protrusion forms a protrusion on the circumferential side of the rotor, and the protrusion contacts the recess on the circumferential side of the rotor with a predetermined contact pressure; or, the recess forms a protrusion on the circumferential side of the rotor, and the protrusion contacts the protrusion on the circumferential side of the rotor with a predetermined contact pressure. (2) The motor according to (1), wherein, The rotor rotates in one direction relative to the stator. When the direction opposite to the rotation direction of the rotor relative to the stator is defined as the reverse direction, The protrusion or the recess that forms the protrusion is formed only on the side in the reverse direction. (3) The motor according to (1) or (2), wherein, The protrusion or the recess has a plurality of protrusions formed on the circumferential side of the rotor, and the plurality of protrusions are arranged at intervals in the radial direction of the rotor. (4) The motor according to any one of (1) to (3), wherein, The driving magnet is a low-hardness component, formed of a material with a hardness lower than that of the magnet holding member; or, the magnet holding member is a low-hardness component, formed of a material with a hardness lower than that of the driving magnet. The protrusion is formed on the low-hardness component. (5) The motor according to any one of (1) to (4), wherein, The protrusion is formed in the magnet contact portion. The recess is formed in the driving magnet. The protrusion is formed on the side of the recess in the circumferential direction of the rotor. (6) The motor according to any one of (1) to (5), wherein, A second protrusion is formed on either the driving magnet or the magnet contact portion, and this second protrusion protrudes axially from the rotor towards the other of the driving magnet and the magnet contact portion than the first protrusion. A second recess is formed on either the drive magnet or the magnet contact portion, the second recess being more recessed in the axial direction of the rotor than the first recess, and is configured for the second protrusion. (7) A pump device comprising: a motor as described in any one of (1) to (6); an impeller that rotates together with the rotor; and a pump chamber configured with the impeller and the rotor and for through which fluid passes.

[0059] In this technology, preferably, the rotor rotates relative to the stator in one direction, and when the direction opposite to the rotor's rotation relative to the stator is designated as the reversing direction, the protrusions are formed only on the side facing the reversing direction in the protrusions or recesses where protrusions are formed. This structure prevents excessive load from being applied to the protrusions during rotor rotation. Therefore, wear on the protrusions can be suppressed.

[0060] In this technology, preferably, the protrusions or recesses are formed with a plurality of protrusions on the circumferential side of the rotor, and these protrusions are arranged at intervals in the radial direction of the rotor. This structure prevents excessive load from being applied to any individual protrusion. Therefore, wear and other issues with the protrusions can be prevented.

[0061] In this technology, preferably, the drive magnet is a low-hardness component, formed of a material with a hardness lower than that of the magnet holding member; or, the magnet holding member is a low-hardness component, formed of a material with a hardness lower than that of the drive magnet, and the protrusion is formed of a low-hardness component. With this structure, when the protrusion is pressed into the recess so that the side of the recess or the side of the protrusion in the circumferential direction of the rotor contacts the protrusion with a specified contact pressure, the protrusion is easily flattened. Therefore, the operation of pressing the protrusion into the recess can be performed easily.

[0062] In this technology, for example, a protrusion is formed on the magnet contact portion, a recess is formed on the drive magnet, and a protrusion is formed on the side of the recess in the circumferential direction of the rotor.

[0063] In this technology, preferably, a second protrusion is formed on either the driving magnet or the magnet contact portion, the second protrusion protruding further in the axial direction of the rotor than the protrusion towards the other side of the driving magnet and the magnet contact portion, and a second recess is formed on the other side of the driving magnet and the magnet contact portion, the second recess being more recessed in the axial direction of the rotor than the recess and being configured for the second protrusion.

[0064] With this structure, before the drive magnet is moved axially relative to the magnet contact portion and the protrusion is pressed into the recess, the second recess, and the second protrusion can be used to position the magnet contact portion and the drive magnet circumferentially on the rotor to make contact with the protrusion with the side of the concave portion or the side of the convex portion in the rotor circumferentially, thus allowing the protrusion to be pressed into the recess. Therefore, the operation of pressing the protrusion into the recess can be performed easily. Furthermore, with this structure, the automatic assembly machine can perform the following actions: moving the drive magnet relative to the magnet holding member circumferentially on the rotor, positioning the magnet contact portion and the drive magnet circumferentially on the rotor using the recess, the second recess, and the second protrusion; then, moving the drive magnet relative to the magnet contact portion axially on the rotor to press the protrusion into the recess. That is, the pressing action of pressing the protrusion into the recess can be performed using an automatic assembly machine. Symbol Explanation

[0065] 2. Pump unit 3 Impeller 4 motors 6 rotors 7. Stator 12 Pump Room 14. Drive magnets (low hardness components) 14b Magnet side contact surface 14c recess 14f second recess 14g protrusion 15 Magnet holding components 15d Magnet contact portion 15f Maintain component side contact surface 15g convex part 15h second convex part CCW reverses the direction.

Claims

1. A motor, characterized in that, include: Rotor; And the stator, which is formed in a cylindrical shape and disposed on the outer periphery of the rotor, The rotor includes: a cylindrical drive magnet; And a cylindrical magnet holding component, wherein the driving magnet is mounted on the outer periphery of the magnet holding component. The axial direction of the cylindrical drive magnet and the axial direction of the cylindrical magnet holding member are aligned with the axial direction of the rotor. The magnet holding component includes a magnet contact portion, which forms a holding component side contact surface. This holding component side contact surface contacts the end face of the drive magnet on one side of the rotor in the axial direction, i.e., the magnet side contact surface. A protrusion is formed on either the driving magnet or the magnet contact portion, and this protrusion protrudes further into the rotor axially than either the magnet-side contact surface or the retaining member-side contact surface towards the other of the driving magnet and the magnet contact portion. The drive magnet and the magnet contact portion are each provided with a recess that is recessed along the axial direction of the rotor from either the magnet-side contact surface or the retaining member-side contact surface, and is configured to accommodate the protrusion. The movement of the drive magnet relative to the magnet contact portion in the circumferential direction of the rotor is restricted by the protrusion and the recess. The protrusion forms a protrusion on the circumferential side of the rotor, and the protrusion contacts the recess on the circumferential side of the rotor with a predetermined contact pressure; or, the recess forms a protrusion on the circumferential side of the rotor, and the protrusion contacts the protrusion on the circumferential side of the rotor with a predetermined contact pressure.

2. The motor according to claim 1, characterized in that, The rotor rotates in one direction relative to the stator. When the direction opposite to the rotation direction of the rotor relative to the stator is defined as the reversal direction... In the protrusion or the recess that forms the protrusion, the protrusion is formed only on the side facing the reverse direction.

3. The motor according to claim 1 or 2, characterized in that, A plurality of protrusions are formed on the side of the convex or concave portion in the circumferential direction of the rotor, and the plurality of protrusions are arranged at intervals in the radial direction of the rotor.

4. The motor according to claim 1 or 2, characterized in that, The driving magnet is a low-hardness component, formed of a material with a hardness lower than that of the magnet holding member; or, the magnet holding member is a low-hardness component, formed of a material with a hardness lower than that of the driving magnet. The protrusion is formed on the low-hardness component.

5. The motor according to claim 1 or 2, characterized in that, The protrusion is formed in the magnet contact portion. The recess is formed in the driving magnet. The protrusion is formed on the side of the recess in the circumferential direction of the rotor.

6. The motor according to claim 1 or 2, characterized in that, A second protrusion is formed on either the driving magnet or the magnet contact portion, and this second protrusion protrudes further along the rotor axially than the first protrusion toward the other side of the driving magnet and the magnet contact portion. The drive magnet and the magnet contact portion are each provided with a second recess, which is more recessed in the axial direction of the rotor than the first recess and is configured for the second protrusion.

7. A pump device, characterized in that, include: The motor according to claim 1 or 2; An impeller that rotates together with the rotor; as well as A pump chamber equipped with the impeller and the rotor and for fluid flow.

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